package com.itbaima.config;

import com.itbaima.filter.JwtAuthenticationTokenFilter;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.config.annotation.authentication.configuration.AuthenticationConfiguration;
import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.http.SessionCreationPolicy;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.security.web.AuthenticationEntryPoint;
import org.springframework.security.web.SecurityFilterChain;
import org.springframework.security.web.access.AccessDeniedHandler;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;

import javax.annotation.Resource;

@Configuration
@EnableWebSecurity
@EnableGlobalMethodSecurity(prePostEnabled = true)
public class SecurityConfig/* extends WebSecurityConfigurerAdapter*/ {

    @Resource
    private AuthenticationConfiguration authenticationConfiguration;
    @Resource
    JwtAuthenticationTokenFilter jwtAuthenticationTokenFilter;
    @Resource
    private AuthenticationEntryPoint authenticationEntryPoint;
    @Resource
    private AccessDeniedHandler accessDeniedHandler;

    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }

    @Bean
    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
        return http
                // 关闭csrf
                .csrf().disable()
                // 不通过Session获取SecurityContext
                .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS)
                .and()
                .authorizeRequests()
                // 对于登录接口 允许匿名访问
                .antMatchers("/user/login").anonymous()
                // 除上面外的所有请求全部需要鉴权认证
                .anyRequest().authenticated()
                .and()
                // 把token校验过滤器添加到过滤器链中
                .addFilterBefore(jwtAuthenticationTokenFilter, UsernamePasswordAuthenticationFilter.class)
                // 配置异常处理器
                .exceptionHandling()
                // 配置认证失败处理器
                .authenticationEntryPoint(authenticationEntryPoint)
                .accessDeniedHandler(accessDeniedHandler)
                .and()
                // 允许跨域
                .cors()
                .and()
                .build();
    }

    @Bean
    public AuthenticationManager authenticationManager() throws Exception {
        return authenticationConfiguration.getAuthenticationManager();
    }

}
